package com.estore.service;
import com.estore.model.Product;
import java.util.Comparator;

/**
 * 商品排序器类，提供多种商品排序方式
 */
public class ProductSorters {

    /**
     * 按商品价格从低到高排序
     */
    public static final Comparator<Product> BY_PRICE_ASC =
        Comparator.comparingDouble(Product::getPrice);

    /**
     * 按商品价格从高到低排序
     */
    public static final Comparator<Product> BY_PRICE_DESC =
        Comparator.comparingDouble(Product::getPrice).reversed();

    /**
     * 按商品库存从多到少排序
     */
    public static final Comparator<Product> BY_STOCK_DESC =
        Comparator.comparingInt(Product::getStock).reversed();
}
